A new species of Characithecium (Monogenea: Dactylogyridae) from external surface and gills of two species of Astyanax (Ostariophysi: Characidae) in southern Brazil

Autores/as

  • Moisés Gallas Universidade Federal do Rio Grande do Sul
  • Cláudia Calegaro-Marques Universidade Federal do Rio Grande do Sul
  • Suzana B. Amato Universidade Federal do Rio Grande do Sul

DOI:

https://doi.org/10.1016/j.rmb.2016.06.011

Palabras clave:

Characids, Dactylogyrid, Ectoparasites, Lake Guaíba, Monogeneans

Resumen

A new species of Characithecium, a genus of monogenean parasites of Neotropical characids, is described from specimens collected on the body surface and gills of Astyanax aff. fasciatus and Astyanax jacuhiensis from Lake Guaíba, State of Rio Grande do Sul, Brazil. The new species is similar to Characithecium costaricensis, but differs by having the haptor separated from the body by a long peduncle, and by having an accessory piece composed of 2 subunits in the male copulatory complex – 1 ventral pincer-shaped at the distal end, and 1 dorsal with an expanded rod-shaped proximal end and the distal end containing 3 elongated projections–, and the dorsal bar usually presenting a small median elevation in the anterior margin. This study increases the number of species of Characitecium to 7 and expands our knowledge on the diversity of monogenean parasites of characids.

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Publicado

2016-08-08

Número

Sección

TAXONOMÍA Y SISTEMÁTICA